DIY amp started smoking.. HELP!?!? - diyAudio
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Old 31st March 2013, 08:37 AM   #1
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Unhappy DIY amp started smoking.. HELP!?!?

So I finished off this amp I got a while ago today, keen to see if it would work and when I turned it on! And then, it started to smoke..
Also there was a lot of static coming through the speakers and a pop when I disconnected my iPod :S

Does anyone know what's going on?? Have I connected it up incorrectly??

This is the amp I have if its any help
Altronics - K5130 50W Amplifier Module Stereo Kit

I tired to make it as compact as possible so maybe I went wrong somewhere there as well?

Cheers guys
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Old 31st March 2013, 09:05 AM   #2
AndrewT is offline AndrewT  Scotland
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Did the bulb in the bulb tester light up?
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Old 31st March 2013, 01:47 PM   #3
johnr66 is offline johnr66  United States
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Yes, I'd guess that something was hooked up wrong. From were did the smoke come? Never power up new builds without current limiting on the supply. (see post #2).
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Old 31st March 2013, 02:09 PM   #4
DUG is offline DUG  Canada
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Lm3886 tab is connected to V-.

Did you isolate the package from heatsink?
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Old 2nd April 2013, 02:17 AM   #5
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Quote:
Originally Posted by DUG View Post
Lm3886 tab is connected to V-.

Did you isolate the package from heatsink?
It appears to be an insulated package lm3886
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Old 2nd April 2013, 03:15 AM   #6
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Is everything isolated from the chassis?
That upside down board especially looks like it could easily have components or traces shorted. It looks like you're already alert to that fact, and are using those rubber feet as stand-offs for the lid. But have you overlooked something there, or another location?
In the photo below I can see component leads underneath the angled sidewall.
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Old 2nd April 2013, 03:57 AM   #7
Mihkus is offline Mihkus  Estonia
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Where did you got those terrible PCBs?!
Does your transformer have 4 output wires like " Black, Black and White White"?
There might be a problem with that
0 tap should be wired as it has 20-20 and if taking voltage from both you get 40.
I once wired it all wrong 20-20 but 0 on both, then my 2X300W TDA8950 died. what a fail.

Last edited by Mihkus; 2nd April 2013 at 04:03 AM.
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Old 2nd April 2013, 04:40 AM   #8
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It smoked from which area. Does it smell foul now.

Gajanan Phadte
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Old 2nd April 2013, 07:01 PM   #9
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So you just wired it up and turned it on? That's not a good idea. You should have used current limiting resistors or a series bulb first. You should have verified that the power supply worked as intended before powering up the amp boards. I would start by isolating the power supply and verifying correct operation.

Shoulda, woulda, coulda. You should have come here first.
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Old 3rd April 2013, 04:55 AM   #10
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He will never forget that smoke is 'the thing' that makes all the circuits work.

Gajanan Phadte
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